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Begin adding the data-structure explaining subsystem. All is contained within

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FossilOrigin-Name: 79ae51c5b1b20ed0a425a87e65a32a096a80b7e1
This commit is contained in:
drh
2011-12-06 19:44:51 +00:00
parent ed51f29774
commit 7e02e5e6b5
13 changed files with 297 additions and 89 deletions
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103
src/select.c
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@@ -4496,96 +4496,65 @@ select_end:
#if defined(SQLITE_DEBUG)
/*
*******************************************************************************
** The following code is used for testing and debugging only. The code
** that follows does not appear in normal builds.
**
** These routines are used to print out the content of all or part of a
** parse structures such as Select or Expr. Such printouts are useful
** for helping to understand what is happening inside the code generator
** during the execution of complex SELECT statements.
**
** These routine are not called anywhere from within the normal
** code base. Then are intended to be called from within the debugger
** or from temporary "printf" statements inserted for debugging.
** Generate a human-readable description of a the Select object.
*/
void sqlite3PrintExpr(Expr *p){
if( !ExprHasProperty(p, EP_IntValue) && p->u.zToken ){
sqlite3DebugPrintf("(%s", p->u.zToken);
}else{
sqlite3DebugPrintf("(%d", p->op);
void sqlite3ExplainSelect(Vdbe *pVdbe, Select *p){
if( p==0 ){
sqlite3ExplainPrintf(pVdbe, "(empty-select)");
return;
}
if( p->pLeft ){
sqlite3DebugPrintf(" ");
sqlite3PrintExpr(p->pLeft);
}
if( p->pRight ){
sqlite3DebugPrintf(" ");
sqlite3PrintExpr(p->pRight);
}
sqlite3DebugPrintf(")");
}
void sqlite3PrintExprList(ExprList *pList){
int i;
for(i=0; i<pList->nExpr; i++){
sqlite3PrintExpr(pList->a[i].pExpr);
if( i<pList->nExpr-1 ){
sqlite3DebugPrintf(", ");
}
}
}
void sqlite3PrintSelect(Select *p, int indent){
sqlite3DebugPrintf("%*sSELECT(%p) ", indent, "", p);
sqlite3PrintExprList(p->pEList);
sqlite3DebugPrintf("\n");
if( p->pSrc ){
char *zPrefix;
sqlite3ExplainPrintf(pVdbe, "SELECT ");
sqlite3ExplainPush(pVdbe);
sqlite3ExplainExprList(pVdbe, p->pEList);
sqlite3ExplainNL(pVdbe);
sqlite3ExplainPop(pVdbe);
if( p->pSrc && p->pSrc->nSrc ){
int i;
zPrefix = "FROM";
sqlite3ExplainPrintf(pVdbe, " FROM ");
sqlite3ExplainPush(pVdbe);
for(i=0; i<p->pSrc->nSrc; i++){
struct SrcList_item *pItem = &p->pSrc->a[i];
sqlite3DebugPrintf("%*s ", indent+6, zPrefix);
zPrefix = "";
sqlite3ExplainPrintf(pVdbe, "%02d: ", i);
sqlite3ExplainPush(pVdbe);
if( pItem->pSelect ){
sqlite3DebugPrintf("(\n");
sqlite3PrintSelect(pItem->pSelect, indent+10);
sqlite3DebugPrintf("%*s)", indent+8, "");
sqlite3ExplainSelect(pVdbe, pItem->pSelect);
}else if( pItem->zName ){
sqlite3DebugPrintf("%s", pItem->zName);
sqlite3ExplainPrintf(pVdbe, "%s", pItem->zName);
}
if( pItem->pTab ){
sqlite3DebugPrintf("(table: %s)", pItem->pTab->zName);
sqlite3ExplainPrintf(pVdbe, " (table: %s)", pItem->pTab->zName);
}
if( pItem->zAlias ){
sqlite3DebugPrintf(" AS %s", pItem->zAlias);
sqlite3ExplainPrintf(pVdbe, " (AS %s)", pItem->zAlias);
}
if( i<p->pSrc->nSrc-1 ){
sqlite3DebugPrintf(",");
}
sqlite3DebugPrintf("\n");
sqlite3ExplainNL(pVdbe);
sqlite3ExplainPop(pVdbe);
}
sqlite3ExplainPop(pVdbe);
}
if( p->pWhere ){
sqlite3DebugPrintf("%*s WHERE ", indent, "");
sqlite3PrintExpr(p->pWhere);
sqlite3DebugPrintf("\n");
sqlite3ExplainPrintf(pVdbe, " WHERE ");
sqlite3ExplainExpr(pVdbe, p->pWhere);
sqlite3ExplainNL(pVdbe);
}
if( p->pGroupBy ){
sqlite3DebugPrintf("%*s GROUP BY ", indent, "");
sqlite3PrintExprList(p->pGroupBy);
sqlite3DebugPrintf("\n");
sqlite3ExplainPrintf(pVdbe, " GROUP BY ");
sqlite3ExplainExprList(pVdbe, p->pGroupBy);
sqlite3ExplainNL(pVdbe);
}
if( p->pHaving ){
sqlite3DebugPrintf("%*s HAVING ", indent, "");
sqlite3PrintExpr(p->pHaving);
sqlite3DebugPrintf("\n");
sqlite3ExplainPrintf(pVdbe, "HAVING ");
sqlite3ExplainExpr(pVdbe, p->pHaving);
sqlite3ExplainNL(pVdbe);
}
if( p->pOrderBy ){
sqlite3DebugPrintf("%*s ORDER BY ", indent, "");
sqlite3PrintExprList(p->pOrderBy);
sqlite3DebugPrintf("\n");
sqlite3ExplainPrintf(pVdbe, " ORDER BY ");
sqlite3ExplainExprList(pVdbe, p->pOrderBy);
sqlite3ExplainNL(pVdbe);
}
sqlite3ExplainPrintf(pVdbe, " END");
}
/* End of the structure debug printing code
*****************************************************************************/
#endif /* defined(SQLITE_TEST) || defined(SQLITE_DEBUG) */